Portable warning sign



FIG. 1 is a front perspective view of a portable warning sign showingour new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view of the claimed design in an alternateposition;

FIG. 9 is a front perspective view of the claimed design in an activestate; and,

FIG. 10 is a rear perspective view of the claimed design in an activestate thereof.

CLAIM The ornamental design for a portable warning sign, as shown anddescribed.